linux-kernel - Re: [PATCH 1/2] dma-mapping: fix page attributes for dma_mmap

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Date:   Mon, 5 Aug 2019 19:55:44 -0700
From:   Gavin Li <gavinli@...gavinli.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Shawn Anastasio <shawn@...stas.io>,
        Michael Ellerman <mpe@...erman.id.au>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
        linux-mips@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Gavin Li <git@...gavinli.com>
Subject: Re: [PATCH 1/2] dma-mapping: fix page attributes for dma_mmap_*

>         /* create a coherent mapping */
>         ret = dma_common_contiguous_remap(page, size, VM_USERMAP,
> -                       arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs),
> +                       dma_pgprot(dev, PAGE_KERNEL, attrs),
>                         __builtin_return_address(0));
>         if (!ret) {
>                 __dma_direct_free_pages(dev, size, page);

Is dma_common_contiguous_remap() still necessary in the
DMA_ATTR_NON_CONSISTENT case? I would presume it would be fine to just
return a linearly mapped address in that case.